1999 horror film by Daniel Myrick and Eduardo Sánchez
The Blair Witch Project is a 1999 American supernatural horror film written, directed, and edited by Daniel Myrick and Eduardo Sánchez. One of the most successful independent films of all time, it is a "found footage" mockumentary in which three students (Heather Donahue, Michael C. Williams, and Joshua Leonard) hike into the Black Hills near Burkittsville, Maryland to shoot a documentary about a local myth known as the Blair Witch. . Myrick and Sánchez conceived of a fictional legend of the Blair Witch in 1993. They developed a 35-page screenplay with the dialogue to be improvised.
https://en.wikipedia.org/wiki/The_Blair_Witch_Project